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Modeling and simulation of droplet wettability using multiphase Lattice Boltzmann method (LBM)

AIP Conference Proceedings 2019年第1期2192卷

作者： Kumara Ari Yuana Eko Prasetyo Budiana Deendarlianto Indarto 1Department of Mechanical and Industrial Engineering Faculty of Engineering Gadjahmada University (Jl. Grafika 2 Yogyakarta 55281 Indonesia) 2Department of Informatics Faculty of Computer Science Amikom Yogyakarta University (Jl. Ringroal Utara Condongcatur Sleman Yogyakarta Indonesia) 3Departement of Mechanical Engineering Faculty of Engineering Sebelas Maret University (Jl. Ir. Sutami 36A Surakarta 57126 Indonesia)

Droplet as the most elementary substance that comprises spray is very important to investigate in engineering and industrial. The applications examples are in spray cooling and spray coating or painting. Droplet characteristics when pinning onto a surface could be hydrophobic, neutral or hydrophilic. In the present work were modeled and simulated the droplet when attached to the surface using multiphase LBM. The pseudo-potential method was used to treat two-phase substance, and the Carnahan-Starling equation of state (EOS) was used to treat both coexistence substance. The validation was used the spurious current that very important in numerical stability. The results were presented in three conditions: hydrophobic, neutral and hydrophilic.

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Erratum: “Review of using gallium nitride for ionizing radiation detection” [Appl. Phys. Rev. 2, 031102 (2015)]

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Applied Physics Reviews 2019年第2期6卷

作者： Jinghui Wang Padhraic Mulligan Leonard Brillson Lei R. Cao 1Nuclear Engineering Program Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 USA 2Department of Radiology Stanford University Stanford California 94305 USA 3Department of Electrical and Computer Engineering The Ohio State University Columbus Ohio 43210 USA 4Department of Physics The Ohio State University Columbus Ohio 43210 USA

The authors replace Table II and its discussion paragraph from their original article1 in order to incorporate the correct information.

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Two-dimensional sparse wavenumber recovery for guided wavefields

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AIP Conference Proceedings 2018年第1期1949卷

作者： Soroosh Sabeti Joel B. Harley 1Department of Electrical and Computer Engineering University of Utah USA 2Department of Mechanical Engineering University of Utah USA

The multi-modal and dispersive behavior of guided waves is often characterized by their dispersion curves, which describe their frequency-wavenumber behavior. In prior work, compressive sensing based techniques, such as sparse wavenumber analysis (SWA), have been capable of recovering dispersion curves from limited data samples. A major limitation of SWA, however, is the assumption that the structure is isotropic. As a result, SWA fails when applied to composites and other anisotropic structures. There have been efforts to address this issue in the literature, but they either are not easily generalizable or do not sufficiently express the data. In this paper, we enhance the existing approaches by employing a two-dimensional wavenumber model to account for direction-dependent velocities in anisotropic media. We integrate this model with tools from compressive sensing to reconstruct a wavefield from incomplete data. Specifically, we create a modified two-dimensional orthogonal matching pursuit algorithm that takes an undersampled wavefield image, with specified unknown elements, and determines its sparse wavenumber characteristics. We then recover the entire wavefield from the sparse representations obtained with our small number of data samples.

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Porous cylinder subjected to conjugate heat transfer-part I

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AIP Conference Proceedings 2019年第1期2200卷

作者： Maughal Ahmed Ali Baig Azeem B. Sridhar Babu M. Gowtha Muneswara Rao 1Department of Mechanical Engineering CMR Technical Campus Hyderabad India 2Department of Mathematics and Computer Science Taylor’s University No. 1 Jalan Taylor’s Subang Jaya - 47500 Selangor DarulEhsan Malaysia 3Department of Mechanical Engineering CMR Institute of Technology Hyderabad India 4Department of Mechanical Engineering CMR Technical Campus Hyderabad India

This article deliberates the investigation of heat transfer in porous annular cylinder subjected to conjugate heat transfer at inner surface. The heating condition is such that the outer surface of the cylinder is heated to constant temperature and inner surface at cold temperature. The heat transfer occurs from outer surface to the inner surface through a solid being attached at inner radius. This article discusses the effect of physical parameters which are taken in terms of dimensionless parameters on heat transfer behavior. The interface of porous and solid wall is applied with proper boundary condition to make sure that there is no storage of heat due to dissimilar mediums.

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Advanced automobile crash detection by acoustic methods

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Proceedings of Meetings on Acoustics 2019年第1期39卷

作者： Keegan Yi Hang Sim Yijia Chen Yuxuan Wan Kevin Chau 1Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay HONG KONG yhsim@connect.ust.hk eekchau@ust.hk 2Department of Computer Science and Engineering Hong Kong University of Science and Technology Clear Water Bay HONG KONG ychenfo@connect.ust.hk 3Department of Computer Engineering Hong Kong University of Science and Technology Clear Water Bay HONG KONG ywanaf@connect.ust.hk

Today’s automobiles are equipped with an increasing variety of safety features, yet the use of acoustic methods for automobile crash prevention and detection has been somewhat limited even though the acoustic waves generated during such events can offer valuable information. For example, the high-pitched squealing caused by tire skidding can provide advance warning especially if it is caused by an adjacent car. During car collisions, the elastic waves traveling along the steel car frame are 17 times faster than the speed of sound in air, which can signal a crash more promptly than center-mounted acceleration sensors. To make full use of the high-speed acoustic signals, a wavelet-based algorithm implementable in real-time has been developed to isolate and detect specific pre-crash and crash events such as honking, tire skidding and collision in multi-channel acoustic datasets. The proposed algorithm offers distinct advantages in sudden onset detection, temporal localization accuracy, and computational cost over existing time- and frequency-domain methods. Results demonstrated on a crash scenario are indicative of a substantial enhancement in automobile pre-crash and crash detection performance by acoustic methods.

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A block based secret sharing scheme using Hilbert matrix and RSA

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AIP Conference Proceedings 2019年第1期2112卷

作者： S. Thalapathiraj P. Mohamed Fathimal B. Baskaran 1Department of Mathematics SRM Institute of Science and Technology Vadapalani campus Chennai Tamilnadu India 2Department of Computer science and Engineering SRM Institute of Science and Technology Vadapalani campus Chennai Tamilnadu India 3Department of Mathematics SRM Institute of Science and Technology Vadapalani campus Chennai Tamilnadu India

Due to the impact of network technology, all information are transmitted in digital mode and the security of information is ever more important. In order to ensure the secret messages are not been stolen when transmitting, it will be a good countermeasure to encrypt the secret message before transmitting. The level of security of information is based on the number of participants. Security is definite when a single person is involved. In the scenario, if many people are involved, security may be ensured if secrets are kept in. This lead the direction for researchers to develop new cryptographic scheme in the past two decades. This paper proposes techniques for transmission of secret messages between two parties and also sharing of messages between multiple parties. These methods uses well known public key cryptography algorithm RSA and Hilbert matrix for authentication and encryption. The proposed method overcome the issues addressed by the existing scheme and ensures secure transmission of text messages with less computational Complexity and no additional code book. The proposed (N, N) Secret sharing Scheme also reduces the overhead of generation of keys for each pair of parties.

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Hybrid control based on sliding mode fuzzy of DFIG power associated WECS

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AIP Conference Proceedings 2019年第1期2123卷

作者： Lakhdar Saihi Fateh Ferroudji Brahim Berbaoui Youcef Bakou Khaled Koussa Farouk Meguellati Khayra Roummani 1Unité de Recherche en Energies Renouvelables en Milieu Saharien URERMS Centre de Développement des Energies Renouvelables CDER 01000 Adrar Alegria 2Department of Electrical and Computer Engineering University of Tahri Mohamed Bechar Bp 417 Algeria

In this paper, the robust algorithm based on the coupling of sliding mode control and the fuzzy logic control is concerned to ameliorate the robustness and the performances of a variable speed wind energy conversion system (WECS) based on vertical axis wind turbine (H-darrieus) with direct attack, connected to electric power grid with a doubly fed induction generator (DFIG). The control independently of stator active and reactive powers is used by stator flux orientation strategy. The active power reference derived from turbine’s mechanical power. The hybrid fuzzy sliding mode control permits to enjoy the advantages of these two techniques in order to reduce the chattering phenomenon. The proposed approach is analysed and compared between SMO and SMOF by Simulink/Matlab environment. The simulation results show good performances and robustness of *** original version of this article supplied to AIP Publishing contained an error in the author’s name. The name originally appeared as, Khaira Roumani, but the correct name is Khayra Roummani. An updated version of this article, with the author’s name corrected, was published on January 24, 2020.

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Publisher's Note: “On direct-writing methods for electrically contacting GaAs and Ge nanowire devices” [Appl. Phys. Lett. 96, 223107 (2010)]

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Applied Physics Letters 2019年第21期115卷

作者： Guannan Chen Eric M. Gallo Jonadan Burger Bahram Nabet Adriano Cola Paola Prete Nico Lovergine Jonathan E. Spanier 1Department of Materials Science and Engineering Drexel University Philadelphia Pennsylvania 19104 USA 2Department of Electrical and Computer Engineering Drexel University Philadelphia Pennsylvania 19104 USA 3Istituto per la Microelettronica e Microsistemi (IMM) Consiglio Nazionale delle Richerche (CNR) Lecce 73100 Italy 4Department of Innovation Engineering Universitá del Salento Lecce 73100 Italy

AIP Publishing has made a change to the author byline after publication. All online versions of the article have been updated.

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Real time biometric surveillance with gait recognition

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AIP Conference Proceedings 2018年第1期1952卷

作者： Subasish Mohapatra Anisha Swain Manaswini Das Subhadarshini Mohanty 1Department of Computer Science and Engineering College of Engineering and Technology Bhubaneswar India 2Department of Instrumentation and Electronics College of Engineering and Technology Bhubaneswar India

Bio metric surveillance has become indispensable for every system in the recent years. The contribution of bio metric authentication, identification, and screening purposes are widely used in various domains for preventing unauthorized access. A large amount of data needs to be updated, segregated and safeguarded from malicious software and misuse. Bio metrics is the intrinsic characteristics of each individual. Recently fingerprints, iris, passwords, unique keys, and cards are commonly used for authentication purposes. These methods have various issues related to security and confidentiality. These systems are not yet automated to provide the safety and security. The gait recognition system is the alternative for overcoming the drawbacks of the recent bio metric based authentication systems. Gait recognition is newer as it hasn’t been implemented in the real-world scenario so far. This is an un-intrusive system that requires no knowledge or co-operation of the subject. Gait is a unique behavioral characteristic of every human being which is hard to imitate. The walking style of an individual teamed with the orientation of joints in the skeletal structure and inclinations between them imparts the unique characteristic. A person can alter one’s own external appearance but not skeletal structure. These are real-time, automatic systems that can even process low-resolution images and video frames. In this paper, we have proposed a gait recognition system and compared the performance with conventional bio metric identification systems.

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Effect of outer surface heating of porous annulus with thermal non equilibrium: Part I

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AIP Conference Proceedings 2019年第1期2200卷

作者： N. Ameer Ahamad Maughal Ahmed Ali Baig Azeem Ajmeera Ramesh 1Mathematics Department Faculty of Science University of Tabuk P.O.BOX.741 Zip.71491 Saudi Arabia 2Department of Mechanical Engineering CMR Technical Campus Hyderabad India 3Department of Mathematics and Computer Science Taylor’s University No. 1 Jalan Taylor’s Subang Jaya - 47500 Selangor DarulEhsan Malaysia

The present article investigates the heat transfer due to a boundary condition in an annular cylinder such that the outer surface is heated with constant temperature and inner surface cooled to isothermal temperature. The impact of thermal non-equilibrium between the two phases i.e. fluid and solid phase of porous medium is analyzed. This article deliberates the effect of various physical parameters such as inter-phase heat transfer coefficient, thermal conductivity ratio and Rayleigh number of the heat transfer characteristics of the porous medium. The upper and lower surfaces of cylinder are maintained adiabatically. Results are repressed in terms of isotherms of fluid and solid phase along with streamline.

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